Add interactive widget voting and fix warnings/bugs

Widget Features:
- Add inline voting to timeline widget when no entry exists for today
- Show random prompt from notification strings in voting mode
- Update vote widget to use simple icon style for selection
- Make stats bar full width in voted state view
- Add Localizable.strings to widget extension target

Bug Fixes:
- Fix inverted date calculation in InsightsViewModel streak logic
- Replace force unwraps with safe optional handling in widgets
- Replace fatalError calls with graceful error handling
- Fix CSV import safety in SettingsView

Warning Fixes:
- Add @retroactive to Color and Date extension conformances
- Update deprecated onChange(of:perform:) to new syntax
- Replace deprecated applicationIconBadgeNumber with setBadgeCount
- Replace deprecated UIApplication.shared.windows API
- Add @preconcurrency for Swift 6 protocol conformances
- Add missing widget family cases to switch statement
- Remove unused variables and #warning directives

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Shared/IAPManager.swift

@@ -167,8 +167,6 @@ class IAPManager: ObservableObject {
     }
 
     private func checkForActiveSubscription() async -> Bool {
-        var foundActiveSubscription = false
-
         for await result in Transaction.currentEntitlements {
             guard case .verified(let transaction) = result else { continue }
 
@@ -178,9 +176,6 @@ class IAPManager: ObservableObject {
             // Check if this is one of our subscription products
             guard productIdentifiers.contains(transaction.productID) else { continue }
 
-            // Found an active subscription
-            foundActiveSubscription = true
-
             // Get the product for this transaction
             currentProduct = availableProducts.first { $0.id == transaction.productID }